The 23-year-old Chester born keeper picked up the injury while on loan to Blue Square Conference side Burton Albion.
The keeper who is out of contract in the summer has been offered a new contract by the club and look set to take the club up on there offer.
Tommo has already had an exploratory keyhole surgery to determine the extent of the damage and will now have surgery to repair the cruciate which will rule him out until next year.
Everyone at Crewe Mad would like to wish The Cat a speedy recovery.